I believe Snoke IS Plagueis but not "time travel" because it doesn't fit into the star wars universe. He could've learned how to manipulate the Midi-chlorian even further by transferring his force essence into another being; a avatar or vessel in other words while Palpatine tried to assassinate him. He hid in the shadows until Palpatine's fall because in his current state he was no match for Palpatine or Darth Vader. Also Episode 1-3 Palpatine was well protected on Coruscant by the republic and EP 4-6 well protected by the Empire on the Deathstar. Once Vader destroyed Palpatine there was no threat to Plagueis anymore so he seized control of the remnant of the empire and made the First Order. FYI Plagueis is Anakin Skywalkers creator because he could manipulate the Midi-chlorians to create life as stated by Palpatine hinting that's how Anakin was conceived. Kylo Ren also refers to Snoke as being "Wise" to his father Han Solo which also hints at Plagueis. If you want to talk more about this please reply I can go over all theories but this is the most dominate one that seems to have any hope of being true.

snoke is not plagueis. palpatine knew how plagueis avoids death, and would have taken every measure to prevent plagueis from coming back. read the new canon books and you'll know that snoke comes from beyond known space. The empire leaves the known galaxy.

You people kidding? There aren't going to be any "midiclorians" or any of that Prequel crap. They did a complete about face regarding the prequels already in TFA. They even destroyed Coruscant (albeit under a different name, so as to avoid uttering that prequelite word).